Paper-gripping device for plate printers



Jan. 26 192550 1,570,936

A. 2*. BOVJEFQS PAPER GRIPPING DEVICE FOR PLATE PRINTERS v Filed August 20 1925 3.5heets-Sheet 1 Jan. 26 ,1926.

A. P. BOWERS PAPER GRIPPING DEVICE FOR PLATE PRINTERS Filed-August 20', 1925' 3 Sheets-Sheet 2 Jari. 26 1926c A. P. WERS PAPER GRIPING DE FOR PLATE PRINTERS Filed August 20, 1925 3 Sheets-Sheet 5 I zezzza m Patented Jan. 26, 19

UNITED, STATES 1,570,936 PATENT OFFICE.

ALBERT P. BOWERS, OF CHICAGO, ILLINOIS, ASSIGNOR TO COLUMBIAN BANK NOTE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PAPER-GRIPPING DEVICE FOR PLATE PRINTERS.

Application filed August 20, 1925.

T all whom it may concern:

Be it known that I, ALBERT P. Bownns, a

. Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Paper-Gripping Devices for Plate Printers, of which the following is a specification. 1

This invention relates to paper gripping devices for plate printers and the like and is fully described in the following specification and shown in the accompanying drawings, in which Figure 1 is a top plan view of a plate printing machine embodying the invention;

Fig. 2 is a partial vertical section on the line 22 of Fig. 1;

Fig. 3 is a partial section on the line 33 of Fig. 2;

. Fig. 4 is an enlarged partial section on the line l-l of Fig. 3 showing the mecha nism gripping a sheet of paper; and

Fig. 5 is a similar view with the gripping mechanism released and showing a sheet of paper fed thereto in position to be gripped.

The embodiment illustrated comprises a plate printing machine having a main frame 10 upon which is slidably mounted a table 11 to which is attached a chain 1.2 which passes over a sprocket 13 which is mounted upon a shaft 14.

A roll 15 is'mounted upon a shaft 16 which is journaled in bearings 17 and 18. This roll is cylindrical exceptfor being cut away at 19. A bar 20 extends substantially the length of the cylindrical. roll and is hingedly mounted within the recess 19 upon the pin 21 which also serves as a means for holdingone end of the cloth 22 which is wrapped about the roll, the opposite end being held by means of screws 23 as shown in Fig. 4;.

The bar 20 is norn'iall held out a ainst the head of the screw 24L by means of the spring 25 and carries a series of gripping Serial No. 51,341.

the shoe 2'? as shown in Fig. 41-, causing the bar 20 to be forced upwardly.

The sheet of paper A is fed to the printer along an inclined member 28 which has an adjustable guide 29 for the paper. IVith the parts in the position shown in Fig. 5, the sheet of paper A is pushed down the inclined member 23 and passes up over the end of the gripping fingers 26 until it oncounters the stops 30.

Thus it'will be seen as the table 11 advances from the position as shown in Fig. 5 it will encounter the yieldable shoe 27 thereby forcing the bar 20 upwardly causing the gripping fingers 26 to grip the sheet of paper A. As the table 11 advances a shoulder 31 on the side (Fig. 2) encounters an car 32 which is hingedly mounted on the end of the roll 15, thereby causing the roll to advance with the table 1.1. The roll is above the main portion of the table 11 and consequently does not come into contact with it. The center portion of the table 11 however carries the engraved plate 33 which is raised above the level of the table 11 and, as the table advances the raised plate 33 engages the sheet A which is now firmly gripped and which advances with the roll 15 which up to this time is pushed forward by the car 32 which is in contact with-the shoulder 31. As soon however as the plate 33 engages the paper A it causes the periphery of the roll 15 to move forward with the gers 26 from the paper A. From this point on the paper A is gripped between the roll 15 and the plate 33.

The table 11 then continues to advance until the plate 33 has passed completely beneath the roll 15. The printed sheet A may then be removed. As soon as this happens a spring mechanism (not shown) within the roll 15 causes the roll to return to its normal position as shown in Fig. 5, so that when the table is then drawn back by the chain 12 to its starting position, and the plate 33 may pass freely beneath the roll 15. The plate 33 is then inked in any well known manner by means not shown, and returned to the starting position. As the table 11 is returned following the printing operation the shoulder 31 encounters the car 32 lifting the latter which is hingedly mounted at the side of the roll 15.

Thus it will be seen that a very eflicient means is provided for accurately positioning and gripping the sheet A with respect to the roll 15 and the plate 33, thereby eliminating a great deal of the hand work of the process now commonly employed forthis purpose.

\Vhile I have shown and described but a single embodiment of this invention, it is to be understood that it is capable of many modifications. Changes therefore in the construction and arrangement may be made which do not depart from the spirit and scope of the invention as disclosed in the appended claims.

I claim:

1. In a plate printing machine, an oscillating roll, a reciprocating table adapted to pass under said roll, a plate carried there by, means on said roll operable by said table for gripping a sheet of paper fed thereto, said means releasing said sheet of paper after the latter is gripped between said roll and plate.

2. In a plate printing machine, an oscillating roll, a reciprocating table adapted to pass under said roll, a plate carried thereby, fingers on said roll operable by said table for gripping a sheet of paper fed thereto, said fingers releasing said sheet of paper after the latter is gripped between said roll and plate.

3. In a plate printing machine, an oscillating roll, a reciprocating table adapted to pass under said roll, a plate carried thereby, a recess in one side of said roll, a bar hingedly mounted therein to swing about an axis parallel to the axis of said roll, 'ripping lingers carried by said bar and adapted to swing with said bar into contact with said roll to grip a sheet of paper therebeneath, stops on said fingers for positioning a sheet of paper fed thereto, a shoe at each end of said bar adapted to be lifted by the table as it moves forward.

4. In a plate printing machine, an oscil lating roll, a reciprocating table adapted to pass under said roll, a plate carried thereby, a recess in one side of said roll, a bar hingedly mounted therein to swing about an axis parallel to the axis of said roll, gripping fingers carried by said bar and adapted to swing with said bar into contact with said roll to grip a sheet of paper therebeneath, stops on said fingers for positioning a sheet of paper fed thereto, an inclined member overlying said table along which a sheet of paper may be fed to said fingers, a shoe at each end of said bar adapted to be lifted by the table as it moves forward.

5. In a plate printing machine, an oscillating roll, a reciprocating table adapted to pass under said roll, a plate carried thereby, a recess in one side of said roll, a bar hingedly mounted therein to swing about an axis parallel to the axis of said roll, gripping lingers carried by said bar and adapted to swing with said bar into contact with said roll to grip a sheet of paper therebeneath, stops on said fingers for positioning-a sheet of paper fed thereto, a. shoe at each end of said bar adapted to be lifted by the table as it moves forward, said fingers releasing said paper after said roll has swung through a predetermined are.

6. In a plate printing machine, an oscillating roll, a reciprocating table adapted to pass under said roll, a plate carried thereby, a recess in one side of said roll, a bar hingedly mounted therein to swing about an axis parallel to the axis of said roll, gripping; fingers carried by said bar and adapted to swing with said bar into contact with said roll to grip a sheet of paper therebeneath, stops on said fingers for positioning a sheet of paper fed thereto, a shoe at each end of said bar adapted to be lifted by the table as it moves forward, said fingers releasing said paper after said roll has swung far enough to permit said shoes to swing free of said table.

In testimony whereof I have hereunto set my hand and seal this 13th day of August, 1925.

ALBERT P. BOIVERS. 

